Deck Board Calculator
Calculate deck boards needed from deck size, board width, spacing, and waste. Outputs board counts, linear feet, and board feet.
Inputs
Tip: Composite decking often uses 1/8 in spacing; wet-treated boards can use tighter gaps.
Results
Boards needed
29
Boards across: 26
Totals
464 ft
212.67 board ft (1 in thick)
Assumptions
- Boards run parallel to the deck length.
- Spacing is the gap between boards.
- Board feet assume 1-inch thickness.
- Waste applies to total board count.
Example
A 16 ft × 12 ft deck using 5.5 in boards, 0.125 in spacing, and 10% waste needs about 29 boards, or 464 linear feet.
FAQ
How much spacing between deck boards?
Most decks use 1/8 in to 1/4 in gaps depending on board type and moisture content.
What is a standard deck board width?
Common decking is sold as 5/4 or 2x6 boards with a typical actual width around 5.5 in.
How much waste should I add?
Plan on 5–10% waste for cuts, defects, and layout changes, and increase for diagonal patterns.